Motor System and Movement Classification Quiz

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Questions and Answers

What specific motor deficit would you expect Jerry to exhibit due to his left-side weakness?

Dysarthria

Ataxia

Visual field cuts

Hemiplegia on the right side (correct)

Which motor tract lesion is most likely responsible for Jerry's left-side weakness?

Medial lemniscus pathway lesion

Corticospinal tract lesion (correct)

Vestibulospinal tract lesion

Spinocerebellar tract lesion

What functional limitation is commonly associated with spasticity following a middle cerebral artery stroke?

Dystonia

Intention tremors

Bradykinesia

Hyperreflexia (correct)

Which area of the brain is primarily affected by a medial motor tract lesion?

Primary motor cortex Signup and view all the answers

Which motor function is commonly impaired due to a lateral motor tract lesion?

Balance and coordination Signup and view all the answers

Which of the following motor tract lesion signs is characterized by hyperactive reflexes?

Hyperreflexia Signup and view all the answers

What is the term used to describe the loss of fractionation of movement seen in motor tract lesions?

Spasticity Signup and view all the answers

In post-stroke impairments, what is a common indicator of loss of proprioception?

Loss of stability Signup and view all the answers

Which motor tract is associated with overactivity in the reticulospinal tract post middle cerebral artery stroke?

Medial motor tracts Signup and view all the answers

What functional limitation can result from myoplastic changes post middle cerebral artery stroke?

Contractures Signup and view all the answers

Which symptom is commonly seen in clients with postural malalignment after a stroke?

Pelvic obliquity Signup and view all the answers

Which group of motor tracts control posture and proximal movements?

Reticulospinal tract Signup and view all the answers

Which tract controls wrist and finger extensors?

Rubrospinal tract Signup and view all the answers

What type of movements do fine movement tracts (lateral MTs) control?

Fractionated movements of the limbs and face Signup and view all the answers

Which motor tract originates in the motor cortex and connects directly to the spinal cord?

Medial corticospinal tract Signup and view all the answers

What limitations are typically associated with MCA stroke?

Visual field deficits Signup and view all the answers

Which tract is involved in postural adjustment and reaching movements?

Lateral vestibulospinal tract Signup and view all the answers

What is the primary function of the lateral corticospinal tract?

Descends to synapse with motor neurons & interneurons in the spinal cord Signup and view all the answers

What sensory inputs are necessary for postural control?

Somatosensation, visual input, vestibular input Signup and view all the answers

Which motor tract facilitates neck movement responses to environmental stimuli?

Medial vestibulospinal tract Signup and view all the answers

What is the function of the nonspecific tracts in motor control?

Facilitate all motor neurons Signup and view all the answers

Study Notes

Motor Deficits and Lesions

Expect left-sided motor deficits, including weakness in the right arm and leg due to contralateral brain involvement.
Common lesion responsible for left-side weakness is found in the right side of the brain, affecting the corticospinal tract.
Spasticity following a middle cerebral artery (MCA) stroke often leads to limited range of motion and difficulties with movement initiation.

Affected Brain Areas and Impairments

A medial motor tract lesion affects the area controlling posture and proximal movements, primarily in the brainstem.
Lateral motor tract lesions commonly impair fine motor skills, like precision in finger movements.
Hyperactive reflexes are signs of upper motor neuron lesions, indicating a motor tract lesion.

Proprioception and Movement Control

Loss of proprioception in post-stroke impairments can manifest as difficulty in spatial awareness and balance.
Overactivity in the reticulospinal tract is associated with motor dysfunction post MCA stroke.
Myoplastic changes can lead to muscle stiffness and weakness, restricting movement after an MCA stroke.

Postural Control and Motor Tracts

Postural malalignment after a stroke often results in the inability to maintain an upright position.
Tracts controlling posture and proximal movements include the vestibulospinal and reticulospinal tracts.
The lateral corticospinal tract specifically controls wrist and finger extensors, enabling gripping and precise hand movements.

Movement Types and Control Mechanisms

Fine movement tracts (lateral motor tracts) are essential for skilled, coordinated tasks, especially in the hands and fingers.
The cortico-spinal tract, originating from the motor cortex, connects directly to the spinal cord, facilitating voluntary movements.
Typical limitations following MCA stroke include hemiparesis, speech deficits, and challenges in daily functional tasks.

Motor Functions and Sensory Inputs

The tract involved in postural adjustment and reaching movements is largely the medial corticospinal tract.
The primary function of the lateral corticospinal tract is to enable voluntary control over skilled and precise motor activities.
Sensory inputs necessary for postural control include proprioceptive feedback, visual cues, and vestibular information.
The nonspecific tracts serve to modulate and enhance the overall motor responses rather than initiate specific movements.

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Description

Test your knowledge on the motor system and movement classifications with this quiz. Explore concepts like motor tracts, posture control, proximal movements, fractionation movements, distal limb movements, and sensory inputs for postural control and reaching/grasping.